Malicious PDF — malware analysis report

Static analysis result for SHA-256 36acc42e36e29f08…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 12:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec2006654e388139bf339f8dd97a3633 SHA-1: 064f30d87b12bd25cf1e55eb34d43fc8df2d06aa SHA-256: 36acc42e36e29f081348ebc5555cd03048f76f3f4c0e4525b4234ce96baf494a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure itself suggests it's designed to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=phytochemical+analysis+test+pdf PDF link annotation
    • http://ghalemdi.com/userfiles/file/vamedokokujavazij.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89979622935.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e5acdb1ef8103fc9d0555550b670815/zesurodopejix.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/46552629322.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/dusuvugoxatonijag.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/68o5fgnkgshkv459ic7hs01q61/vexobakugetav.pdfIn PDF document text
    • http://fruitvita.com/files/files/45703361499.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/92388876098.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609068daaa210---nemobefamonufozepotezuri.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97736285715.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2v2q6f8qcfdp8pgst6vvkua86r/9410773050.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/sulabisarazixefamoj.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/56764507343.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eh38ga23psc4mokq9l67k262p1/sijefarorotezi.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/4347848785.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/94386306275.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/d4p8rhkda1qtc38c47ljtgur0c/12704553802.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/gulorof.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffca2e480---679154892.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/namakararagikopaxoki.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/zomamonomukitabi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/96679072388.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/78104951083.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/95c12a97fc80cbea9d01d42efd5960eb/89688606885.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/a2la9150e7r1giu8dejba3g5h7/37503068954.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 10900 bytes
SHA-256: 673a7835b61763a303f16864380b029696d9e9478dda9d91f160970095e5d84a
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 18740 bytes
SHA-256: 8ee3b295c336e7058e9330f10d3e9c165b81ca141f09efbe8f4f4b33918f4a18
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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